Electrostatic
painting is a term used to describe a special type of painting process
based on electrostatic principles. The concept was developed way
back on March 6th, 1938 by a member of the Ransburg family who was
involved in the making of pottery at that time. The company needed
a way to efficiently coat the metal stands that they used for their
flowers and pottery. This young man developed a system where an
efficiently applied electric charge would be sent into liquid paint and
a grounded charge applied to the object to be painted. The theory
was that the atomized and charged particles of paint would be attracted
to the surface of the object by magnetic attraction and there should be
little if any waste.
A demonstration was
performed using a metal salt shaker. The shaker was hung in front
of a small spray gun, and when the spray was turned on for a few
seconds, only one side was coated. Then four fine wires were
evenly spaced around the shaker and charged with electrical current
while the shaker was appropriately grounded. When the spray
pattern was repeated, the shaker was coated evenly on all sides, top,
and bottom.
This is the same
principle that is embodied into today's modern electrostatic painting
equipment. A conventional spray paint application only applies
paint to the surface directly in front of the paint gun. An
electrostatic paint gun wraps the material completely around the surface
ensuring an even coat of uniform thickness.
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